All of his time-honored rules of interplanetary navigation had been upset by this new cruiser, a craft entirely without gravity-screens which was flashing from sun to sun propelled by invisible vibrations only.

Compare to the more personal gravity web from Frank Herbert's 1969 novel Whipping Star, as well as cavorite from the 1901 novel The First Men in the Moon by H.G. Wells, the gravity-neutralizing disks from Edmond Hamilton's 1937 short story Fessenden's Worlds (which are for the lab) and the sleeping plates from Larry Niven's 1966 novella Neutron Star (which are for the bedroom). Also, the momentum screen from Completely Automatic, a 1941 story by Theodore Sturgeon.